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| Titel |
Effects of rodent-induced land degradation on ecosystem carbon fluxes in an alpine meadow in the Qinghai–Tibet Plateau, China |
| VerfasserIn |
F. Peng, Y. Quangang, X. Xue, J. Guo, T. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 1 ; Nr. 6, no. 1 (2015-03-04), S.303-310 |
| Datensatznummer |
250115404
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| Publikation (Nr.) |
 copernicus.org/se-6-303-2015.pdf |
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| Zusammenfassung |
| The widespread land degradation in an alpine meadow ecosystem would affect
ecosystem carbon (C) balance. Biomass, soil chemical properties and carbon
dioxide (CO2) of six levels of degraded lands (D1–D6, according to the
number of rodent holes and coverage) were investigated to examine the effects
of rodent-induced land degradation on an alpine meadow ecosystem. Soil
organic carbon (SOC), labile soil carbon (LC), total nitrogen (TN) and
inorganic nitrogen (N) were obtained by chemical analysis. Soil respiration
(Rs), net ecosystem exchange (NEE) and ecosystem respiration (ER)
were measured by a Li-Cor 6400XT. Gross ecosystem production (GEP) was the
sum of NEE and ER. Aboveground biomass (AGB) was based on a linear regression
with coverage and plant height as independent variables. Root biomass (RB)
was obtained by using a core method. Soil respiration, ER, GEP and AGB were
significantly higher in slightly degraded (D3 and D6, group I) than in
severely degraded land (D1, D2, D4 and D5, group II). Positive values of NEE
average indicate that the alpine meadow ecosystem is a weak C sink during the
growing season. The only significant difference was in ER among different
degradation levels. Rs, ER and GEP were 38.2, 44.3 and 46.5%
higher in group I than in group II, respectively. Similar difference of ER
and GEP between the two groups resulted in an insignificant difference of
NEE. Positive correlations of AGB with ER, NEE and GEP, and relatively small
AGB and lower CO2 fluxes in group II, suggest the control of AGB on
ecosystem CO2 fluxes. Correlations of RB with SOC, LC, TN and inorganic
N indicate the regulation of RB on soil C and N with increasing number of
rodent holes in an alpine meadow ecosystem in the permafrost region of the
Qinghai–Tibet Plateau (QTP). |
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